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Reference 1220w 12" Woofer � Technical Data
CAR AUDIO
SPECIFICATIONS
DIAMETER: SENSITIVITY (2.83 V @ 1 M): POWER HANDLING: FREQUENCY RESPONSE: NOMINAL IMPEDANCE: VOICE-COIL DIAMETER: DIMENSIONS: 12" (304.8 MM) 92 dB 300 WRMS 20 ~ 800 HZ 4 OHMS 2.0" (50.0 MM)
SEALED BOX VOLUME (INCLUDES DRIVER DISPLACEMENT)
Reference 1220w
(side view)
mounting depth 6.125" (155.58 mm)
VBOX = 1.25 ft3 (35.40 liters)
(all sides lined with 1-inch fiberglass or fiberfill)
cutout diameter 11.125" (282.58 mm) outer diameter 12.25" (311.15 mm)
SEALED FREQUENCY RESPONSE @ 2.83 V
100 dB In-Car 12 dB LP @ 80 Hz 95
THIELE-SMALL PARAMETERS
VOICE COIL DC RESISTANCE: R
EVC
90 85
Out-Of-Car
(OHMS) . . . . . . 3.43
VOICE COIL INDUCTANCE @ 1 KHZ: L EVC (MH) . . . . . . . 1.16 DRIVER RADIATING AREA: S D (IN 2) . . . . . . . . 82.15 S D (M2) . . . . . . . 530.00 MOTOR FORCE FACTOR: COMPLIANCE VOLUME: SUSPENSION COMPLIANCE: MOVING MASS, AIR LOAD: MOVING MASS, DIAPHRAGM: FREE-AIR RESONANCE: MECHANICAL Q: ELECTRICAL Q: TOTAL Q: MAGNETIC-GAP HEIGHT: VOICE-COIL HEIGHT: MAXIMUM EXCURSION: BL (TM) . . . . . . . . 10.86 VAS (FT3) . . . . . . . . 4.55 VAS (LITERS) . . . . 128.80 C MS (µM/N) . . . . 320.47 MMS (GRAMS). . . . 137.20 MMD (GRAMS) . . . 130.14 FS (HZ) . . . . . . . . 24.00 Q MS . . . . . . . . . . . 8.21 Q ES . . . . . . . . . . . . 0.60 Q TS . . . . . . . . . . . . 0.56 HAG (IN) . . . . . . . . . 0.31 HAG (MM) . . . . . . . . 7.92 H (IN) . . . . . . . . . 1.25
VC
80 75 70
65
C
60 20 Frequency 50 100 Hz 200 500 1k
2k
SEALED EXCURSION/GROUP DELAY @ 250 W
20.0 Xd mM 17.5 15.0 T mSec 20 15 10
12.5
Group Delay
5
10.0
0
7.5 5.0 2.5 0.0 20 Frequency 50 100 Hz 200 500 1k Transducer Excursion
C
-5 -10 -15 -20
HVC (MM) . . . . . . . 31.75 X MAX (IN) . . . . . . . . 0.47 X MAX (MM) . . . . . . 11.91
2k
Harman Consumer Group � 250 Crossways Park Drive � Woodbury, NY 11797 � VOICE: 516-496-3400 � FAX: 516-496-4868 � www.infinitysystems.com
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